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Financial Risk Management - Summary of Exposure of Trade Receivables and Contract Assets (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure Of Exposure of trade receivables and contract assets Explanatory [Abstract] |  |
Gross balance | kr 53,902 | kr 52,799
Allowance for expected credit losses | (2,827) | (2,585)
Net balance and carrying value | kr 51,075 | kr 50,214

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- Definition Change in exposure and carrying value to credit risk. + References No definition available. + Details
Name: | eric_ChangeInExposureAndCarryingValueToCreditRisk
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Change in exposure to credit risk. + References No definition available. + Details
Name: | eric_ChangeInExposureToCreditRisk
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Disclosure Of exposure of trade receivables and contract assets explanatory + References No definition available. + Details
Name: | eric_DisclosureOfExposureOfTradeReceivablesAndContractAssetsExplanatoryAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Provisions for expected credit losses on trade receivables and contract assets. + References No definition available. + Details
Name: | eric_ProvisionsForExpectedCreditLossesOnTradeReceivablesAndContractAssets
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant